Can someone explain what I did wrong? I’m very confused

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5